15261695987 has 2 divisors, whose sum is σ = 15261695988. Its totient is φ = 15261695986.

The previous prime is 15261695971. The next prime is 15261695993. The reversal of 15261695987 is 78959616251.

It is a strong prime.

It is an emirp because it is prime and its reverse (78959616251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15261695987 - 2⁴ = 15261695971 is a prime.

It is a super-2 number, since 2×15261695987² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15261695927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7630847993 + 7630847994.

It is an arithmetic number, because the mean of its divisors is an integer number (7630847994).

Almost surely, 2^15261695987 is an apocalyptic number.

15261695987 is a deficient number, since it is larger than the sum of its proper divisors (1).

15261695987 is an equidigital number, since it uses as much as digits as its factorization.

15261695987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 59.

The spelling of 15261695987 in words is "fifteen billion, two hundred sixty-one million, six hundred ninety-five thousand, nine hundred eighty-seven".